I have recorded 67759, 68936 and 69077. This was Walther's own design of a DSM 34, thought they made them too. This model and others are discussed in John Speed's book on Mauser .22 rifles. Yours is Crown/N?

What is holding that front band on? The stacking rod is integral to holding the rifle together by tightening down that front cupped band on the the end of the stock. Is the bolt numbered to match on the underside?